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排序方式: 共有340条查询结果,搜索用时 15 毫秒
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Steffen Fritz Linda See Ian McCallum Liangzhi You Andriy Bun Elena Moltchanova Martina Duerauer Fransizka Albrecht Christian Schill Christoph Perger Petr Havlik Aline Mosnier Philip Thornton Ulrike Wood‐Sichra Mario Herrero Inbal Becker‐Reshef Chris Justice Matthew Hansen Peng Gong Sheta Abdel Aziz Anna Cipriani Renato Cumani Giuliano Cecchi Giulia Conchedda Stefanus Ferreira Adriana Gomez Myriam Haffani Francois Kayitakire Jaiteh Malanding Rick Mueller Terence Newby Andre Nonguierma Adeaga Olusegun Simone Ortner D. Ram Rajak Jansle Rocha Dmitry Schepaschenko Maria Schepaschenko Alexey Terekhov Alex Tiangwa Christelle Vancutsem Elodie Vintrou Wu Wenbin Marijn van der Velde Antonia Dunwoody Florian Kraxner Michael Obersteiner 《Global Change Biology》2015,21(5):1980-1992
A new 1 km global IIASA‐IFPRI cropland percentage map for the baseline year 2005 has been developed which integrates a number of individual cropland maps at global to regional to national scales. The individual map products include existing global land cover maps such as GlobCover 2005 and MODIS v.5, regional maps such as AFRICOVER and national maps from mapping agencies and other organizations. The different products are ranked at the national level using crowdsourced data from Geo‐Wiki to create a map that reflects the likelihood of cropland. Calibration with national and subnational crop statistics was then undertaken to distribute the cropland within each country and subnational unit. The new IIASA‐IFPRI cropland product has been validated using very high‐resolution satellite imagery via Geo‐Wiki and has an overall accuracy of 82.4%. It has also been compared with the EarthStat cropland product and shows a lower root mean square error on an independent data set collected from Geo‐Wiki. The first ever global field size map was produced at the same resolution as the IIASA‐IFPRI cropland map based on interpolation of field size data collected via a Geo‐Wiki crowdsourcing campaign. A validation exercise of the global field size map revealed satisfactory agreement with control data, particularly given the relatively modest size of the field size data set used to create the map. Both are critical inputs to global agricultural monitoring in the frame of GEOGLAM and will serve the global land modelling and integrated assessment community, in particular for improving land use models that require baseline cropland information. These products are freely available for downloading from the http://cropland.geo-wiki.org website. 相似文献
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Lynn McCallum Wanhua Lu Susan Price Noureddine Lazar Bernard Perbal Alexandra E. Irvine 《Journal of cell communication and signaling》2009,3(2):115-124
Chronic Myeloid Leukaemia (CML) is characterized by expression of the constitutively active Bcr-Abl tyrosine kinase. We have shown previously that the negative growth regulator, CCN3, is down-regulated as a result of Bcr-Abl kinase activity and that CCN3 has a reciprocal relationship of expression with BCR-ABL. We now show that CCN3 confers growth regulation in CML cells by causing growth inhibition and regaining sensitivity to the induction of apoptosis. The mode of CCN3 induced growth regulation was investigated in K562 CML cells using gene transfection and treatment with recombinant CCN3. Both strategies showed CCN3 regulated CML cell growth by reducing colony formation capacity, increasing apoptosis and reducing ERK phosphorylation. K562 cells stably transfected to express CCN3 showed enhanced apoptosis in response to treatment with the tyrosine kinase inhibitor, imatinib. Whilst CCN3 expression was low or undetectable in CML stem cells, primary CD34+ CML progenitors were responsive to treatment with recombinant CCN3. This study shows that CCN3 is an important growth regulator in haematopoiesis, abrogation of CCN3 expression enhances BCR-ABL dependent leukaemogenesis. CCN3 restores growth regulation, regains sensitivity to the induction of apoptosis and enhances imatinib cell kill in CML cells. CCN3 may provide an additional therapeutic strategy in the management of CML. 相似文献
86.
The structure of the contact network between individuals has a profound effect on the transmission of infectious disease. Using a novel technology – proximity sensing radio collars – we described the contact network in a population of Tasmanian devils. This largest surviving marsupial carnivore is threatened by a novel infectious cancer. All devils were connected in a single giant component, which would permit disease to spread throughout the network from any single infected individual. Unlike the contact networks for many human diseases, the degree distribution was not highly aggregated. Nevertheless, the empirically derived networks differed from random networks. Contact networks differed between the mating and non-mating seasons, with more extended male–female associations in the mating season and a greater frequency of female–female associations outside the mating season. Our results suggest that there is limited potential to control the disease by targeting highly connected age or sex classes. 相似文献
87.
Yong-Bi Fu Gregory W. Peterson Brent D. McCallum Li Huang 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2010,120(2):271-281
Little is known about the genetic control of heterosis in the complex polyploid crop species oilseed rape (Brassica napus L.). In this study, two large doubled-haploid (DH) mapping populations and two corresponding sets of backcrossed test hybrids
(THs) were analysed in controlled greenhouse experiments and extensive field trials for seedling biomass and yield performance
traits, respectively. Genetic maps from the two populations, aligned with the help of common simple sequence repeat markers,
were used to localise and compare quantitative trait loci (QTL) related to the expression of heterosis for seedling developmental
traits, plant height at flowering, thousand seed mass, seeds per silique, siliques per unit area and seed yield. QTL were
mapped using data from the respective DH populations, their corresponding TH populations and from mid-parent heterosis (MPH)
data, allowing additive and dominance effects along with digenic epistatic interactions to be estimated. A number of genome
regions containing numerous heterosis-related QTL involved in different traits and at different developmental stages were
identified at corresponding map positions in the two populations. The co-localisation of per se QTL from the DH population
datasets with heterosis-related QTL from the MPH data could indicate regulatory loci that may also contribute to fixed heterosis
in the highly duplicated B. napus genome. Given the key role of epistatic interactions in the expression of heterosis in oilseed rape, these QTL hotspots might
harbour genes involved in regulation of heterosis (including fixed heterosis) for different traits throughout the plant life
cycle, including a significant overall influence on heterosis for seed yield. 相似文献
88.
Zhenyu Wang Zhenqing Zhang Scott A. McCallum Robert J. Linhardt 《Analytical biochemistry》2010,398(2):275-973
Traditional chromatographic quantification methods for heparosan produced from the Escherichia coli K5 strain rely on extensive purification requiring laborious sample preparation. These methods are time-consuming, often resulting in sample loss during purification, and thus might not accurately reflect the amount of heparosan in the original mixture. A simple, sensitive 1H nuclear magnetic resonance (NMR) quantification method that directly quantifies heparosan K5 polysaccharide present in E. coli fermentation supernatant is described. 相似文献
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